ML18019A424

Forwards Addl Info Re Double Fusing of Control Circuits for Fire Protection,In Response to SER Open Item 8

ML18019A424
Person / Time
Site:	Harris
Issue date:	10/15/1985
From:	Zimmerman S CAROLINA POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NLS-85-372, NUDOCS 8510180181
Download: ML18019A424 (5)

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REGULA Y FORMATION DISTRIBUTIO M (RIDS)

ACCESSION NBR:8510180181 DOC ~ DATE: 85/10/15 NOTARIZED; NO DOCKET' PACIL:50-000 Shearon Harris Nuclear Power Planti Unit 1i Carolina 05000<<00 AUTH",NAME AUTHOR AFFILIATION ZIMMERMANES ~ R ~ Car o l ina Power 5 Li ght Co ~

RECIP NAME

~ RECIPIENT AFFILIATION DENTON,H,RE Office of Nuclear Reactor Regulationg Director

SUBJECT:

Forwards addi info re double fusing of control circuits for fire protectioniin response to SER Open Item 8, DISTRIBUTION CODE: BOOED COPIES RECEIVED:LTR TITLE: Licensing Submittal: Fire Protection

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CHILL Carolina Power & Light Company SERIAL: NLS-85-372 OGT y 5 lS8S Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. l - DOCKET NO.50-000 FIRE PROTECTION - DOUBLE FUSING

Dear Mr. Denton:

Carolina Power R Light Company hereby submits additional information concerning double fusing of control circuits at the Shearon Harris Nuclear Power Plant. The attached information is submitted in response to Safety Evaluation Report Open Item No. 8 concerning fire protection.

If you have any questions concerning this subject or require additional information, please contact me at (9l9) 836-6202.

Yours very truly,

~

S .~ Z'erman anager Nuclear Licensing Section SRZ/3HE/mf (20313DK)

Attachment cc: Mr. B. C. Buckley (NRC) Mr. Wells Eddleman Mr. G. F. Maxwell (NRC-SHNPP) Mr. 3ohn D. Runkle Dr. 3. Nelson Grace (NRC-RII) Dr. Richard D. Wilson Mr. Travis Payne (KUDZU) Mr. G. O. Bright (ASLB)

Mr. Daniel F. Read (CHANGE/ELP) Dr. 3. H. Carpenter (ASLB)

Mr. N. Wagner (NRC-ASB) Mr. 3. L. Kelley (ASLB)

Mr. O. Chopra (NRC-PSB) Mr. H. A. Cole Wake County Public Library 85i0180i8i 85i0i5 PDR 'ADOCK 05000400 >

E PDR 411 Fayettevilte Street ~ P. O. Box 1551 ~ Raleigh, N. C. 27602

Shearon Harris Nuclear Power Plant

'SER Open Item No. 8, Fire Protection NRC uestion No. 010.50, Double Fusin An electrical isolation deficiency has been identified in which fuses in transfer switches might have had to be replaced in order to maintain a hot shutdown condition. This deficiency is discussed in the attachment (Appendix A). Provide notification as to whether a similar problem exists in the transfer switches in the Shearon Harris Plant. If such a deficiency exists in the Shearon Harris Plant, you should further advise us as to how this deficiency will be corrected as discussed in Appendix A.

Revised Res onse Control circuits for equipment necessary to achieve and maintain hot shutdown from the Auxiliary Control Panel following a fire which forces evacuation of the Control Room will be provided with redundant fuses. The 120VAC essential control circuits have been isolated with transfer switches and provided with redundant fuses in the motor control centers or transfer panels. Essential 125VDC control circuits will also be provided with redundant fuses in the switchgear/power center or transfer panels to ensure their operability after transfer.

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